Sadly, the diesel is not available in the states. This year, the new gas model just became available through the Penske dealers in the USA.
The car has been in Europe since 1998. In Canada it became available during 2005 through to 2007, but they sold only the diesel version up here. They sold 4 times (about 12,000 units total sold) what they estimated would sell in Canada, and many people believe that was a big part of the decision to revamp the car and try it in the states.
The new car isn't turbo, isn't a Getrag 6 speed, and it is a touch longer than the original. There are a few other nice things missing from the new version.
There is hope for future model years. The Mercedes Bluetec diesel is rumoured to be coming down the pipe. A turbo is coming for N.A., and when it does, Brabus will work it's magic on the car. They were able to make the old gas version put out a reliable 101 HP, which made it very interesting. The new Brabus tuned version will likely be quicker.
As you can probably tell, I like the car. LOL.
Lots more info at the car club website I'm part of:
Club smart car